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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of deferred tax assets and liabilities | Significant components of the Corporation’s deferred tax assets and liabilities are as follows:
December 31 (In thousands) |  | 2017 |  | 2016
Deferred tax assets: |  |
Allowance for loan losses |  | $ | 10,498 |  |  | $ | 17,719 |
Accumulated other comprehensive loss – Pension plan |  | 7,098 |  |  | 7,937 |
Accumulated other comprehensive loss – Unrealized losses on securities |  | 946 |  |  | 1,618 |
Deferred compensation |  | 2,744 |  |  | 4,140 |
OREO valuation adjustments |  | 1,327 |  |  | 2,322 |
Net deferred loan fees |  | 1,115 |  |  | 1,397 |
Deferred contract bonus |  | 645 |  |  | 1,074 |
Nonvested equity-based compensation |  | 1,069 |  |  | 1,115 |
Fixed assets |  | 877 |  |  | 781 |
Accrued litigation |  | 4 |  |  | 793 |
Other |  | 1,226 |  |  | 2,525 |
Total deferred tax assets |  | $ | 27,549 |  |  | $ | 41,421 |
Deferred tax liabilities: |  |  |  |
Deferred investment income |  | 6,120 |  |  | 10,199 |
Pension plan |  | 19,076 |  |  | 26,344 |
Mortgage servicing rights |  | 2,034 |  |  | 3,243 |
Partnership adjustments |  | 460 |  |  | 549 |
Other |  | 364 |  |  | 596 |
Total deferred tax liabilities |  | $ | 28,054 |  |  | $ | 40,931 |
Net deferred tax (liability) asset |  | $ | (505 | ) |  | $ | 490 |
Federal and state income taxes | The components of the provision for federal income taxes are shown below:
December 31, (In thousands) |  | 2017 |  | 2016 |  | 2015
Currently payable |  |  |  |  |  |
Federal |  | $ | 20,660 |  |  | $ | 28,879 |  |  | $ | 26,153 |
Amortization of qualified affordable housing projects |  | 10,278 |  |  | 7,300 |  |  | 6,664 |
Deferred |  |  |  |  |  |
Federal |  | 3,289 |  |  | 581 |  |  | (250 | )
Total |  | $ | 34,227 |  |  | $ | 36,760 |  |  | $ | 32,567 |
Schedule of income tax rate reconciliation | The following is a reconciliation of income tax expense to the amount computed at the statutory rate of 35% for the years ended December 31, 2017, 2016 and 2015.
|  | 2017 |  | 2016 |  | 2015
Statutory federal corporate tax rate |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
Changes in rates resulting from: |  |  |  |  |  |
Tax exempt interest income, net of disallowed interest |  | (2.8 | )% |  | (1.3 | )% |  | (0.5 | )%
Bank owned life insurance |  | (1.4 | )% |  | (1.2 | )% |  | (1.8 | )%
Investments in qualified affordable housing projects, net of tax benefits |  | (1.9 | )% |  | (1.7 | )% |  | (1.9 | )%
Other tax credits |  | — | % |  | — | % |  | (0.9 | )%
KSOP dividend deduction |  | (1.0 | )% |  | (1.0 | )% |  | (1.0 | )%
Impact of the Tax Cuts and Jobs Act (1) |  | 1.0 | % |  | — | % |  | — | %
Other |  | — | % |  | 0.1 | % |  | (0.2 | )%
Effective tax rate |  | 28.9 | % |  | 29.9 | % |  | 28.7 | %
Reconciliation of unrecognized tax benefits | The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits.
(In thousands) |  | 2017 |  | 2016 |  | 2015
January 1 Balance |  | $ | 633 |  |  | $ | 558 |  |  | $ | 532 |
Additions based on tax positions related to the current year |  | 117 |  |  | 117 |  |  | 80 |
Additions for tax positions of prior years |  | — |  |  | 38 |  |  | 16 |
Reductions for tax positions of prior years |  | (9 | ) |  | — |  |  | — |
Reductions due to statute of limitations |  | (77 | ) |  | (80 | ) |  | (70 | )
December 31 Balance |  | $ | 664 |  |  | $ | 633 |  |  | $ | 558 |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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